<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Feed_Reader
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Feed.php 18951 2009-11-12 16:26:19Z alexander $
 */

/**
 * @see Zend_Feed_Reader_Extension_FeedAbstract
 */
require_once 'Zend/Feed/Reader/Extension/FeedAbstract.php';

/**
 * @category   Zend
 * @package    Zend_Feed_Reader
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Feed_Reader_Extension_CreativeCommons_Feed
extends Zend_Feed_Reader_Extension_FeedAbstract
{
	/**
	 * Get the entry license
	 *
	 * @return string|null
	 */
	public function getLicense($index = 0)
	{
		$licenses = $this->getLicenses();

		if (isset($licenses[$index])) {
			return $licenses[$index];
		}

		return null;
	}

	/**
	 * Get the entry licenses
	 *
	 * @return array
	 */
	public function getLicenses()
	{
		$name = 'licenses';
		if (array_key_exists($name, $this->_data)) {
			return $this->_data[$name];
		}

		$licenses = array();
		$list = $this->_xpath->evaluate('channel/cc:license');

		if ($list->length) {
			foreach ($list as $license) {
				$licenses[] = $license->nodeValue;
			}

			$licenses = array_unique($licenses);
		}

		$this->_data[$name] = $licenses;

		return $this->_data[$name];
	}

	/**
	 * Register Creative Commons namespaces
	 *
	 * @return void
	 */
	protected function _registerNamespaces()
	{
		$this->_xpath->registerNamespace('cc', 'http://backend.userland.com/creativeCommonsRssModule');
	}
}
